Category: Electronics Projects

Sound Operated Intruder Alarm with Flash

Engineeering Projects
circuit diagram of sound operated intruder alarm with flash

Sound Operated Intruder Alarm with extra features like a flashlight, circuit diagram, description with working principle, and parts list. Introduction to Sound Operated Intruder Alarm with Flash If you have already gone through the previous project Op-amp 741 Based Sound operated Light on our website, then for you this project is a transformation of that generalized project into a specialized intruder’s alarm project. Why should one invest much effort, time, and money to recreate a new circuit when a slight modification to the existing project works fine? This is the core…

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Op-Amp 741 Based Sound Operated Light

Engineeering Projects
circuit diagram of sound operated light

Op-Amp 741 Based Sound Operated Light Circuit Diagram, Circuit Description with Working Principle and Parts List Introduction to Op-Amp 741 Based Sound Operated Light In contrast to where so far the technological development has brought us, this project might seem so plain, but it is a basic project that supports advanced projects, helps newcomers in the electronics field to understand the fundamentals, and being much economical provides extra credits to the users. This mini-project op-amp 741 Based Sound Operate Light builds up a small gadget/device which can be employed to turn…

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Data Logger Using Computer

Engineeering Projects
circuit diagram of data logger using computer

The project described here is a simple Data logger project using a computer that can be used in physics laboratories with the purpose to automate simple experiments or monitor slowly varying physical variables such as temperature. Physics can be interesting and boring at the same time. It might get boring for the reason that most of the physical parameters vary frequently with values or physical properties they execute and we lack the apparatus to measure them accurately. This leads us to the fact that we cannot get a precise measurement.…

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Monitoring System using AT89C51

Engineeering Projects
circuit diagram of monitoring system using at89c51

Introduction to Monitoring System using AT89C51: Intercoms and calling bells fit properly only in the luxurious hotels, lodges, and high-class buildings. In small vicinities like small hotels, offices, and clinics, these are not the correct options to choose for communication between the working/assisting staff and people. It is all because of the cost and the fact that this provision can be made for a limited number of points. Here’s a simple and economical room-monitoring system that provides audio-visual identification of the call point. In addition to this, the system also…

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PIC16F73 Based Temperature Indicator and Controller

Engineeering Projects
Circuit Diagram of PIC16F73 Based Temperature Indicator and Controller

PIC16F73 Based Temperature Indicator and Controller A normal thermometer gives an indication of the temperature. Focus on the fact ‘indication’, i.e. it only reads and displays the reading. Using this property, here we have presented a standalone digital thermometer that also controls the temperature of the heating element of a device according to its requirement, along with the temperature reading function.  In order to transform our logic into practical implementation, we took the help of a Microcontroller (PIC16F73) which ensures dynamic and faster control. Additional components like temperature-controller knob and…

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Load Protector Circuit and Remote Switching

Engineeering Projects
circuit diagram of load protector with remote switching facility

Introduction | Load Protector Circuit and Remote Switching Have you ever noticed the number of devices used at your house to serve your purpose? There are many. These devices require a specified rate of power to operate. Maximum variations in voltage/ power and load can destroy most of the devices like inverters and UPS systems since it can cause excessive heating of the output transformer windings and the active driving device and thereby damage them. And, some domestic appliances also need to be protected against under/over-voltage. This particular circuit serves the…

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Cell Phone Jammer Circuit

Engineeering Projects
circuit diagram of cell phone jammer

Introduction to Cell Phone Jammer Circuit: Our addiction to technological development has made it so that it is almost impossible to imagine a day without those amazing inventions. Cell phones popular as mobile phones are the ones we cannot separate from the essential list. By now, they have become an inseparable part of our lives. Talking about a country like Nepal which has a low population (approx. 5 million), mainly two categories of cell phone carriers are available namely; NTC and Ncell. They use GSM 900 or 1800 systems. The…

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Fire Alarm Using Thermistor and NE555

Engineeering Projects
circuit diagram of fire alarm using thermistor

If we search for fire alarm circuits on the internet, we can find a long list of such circuits. Most of those circuits are quite expensive and also the components may not be easily available. So, here we have presented a simple and inexpensive project of ‘fire alarm using thermistor and NE555’. Where a thermistor is the main component and is used as a temperature sensor of the fire alarm. Talking about the working principle of a thermistor, it works in the same way a normal LDR would work i.e.…

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Speech Communication using Laser

Engineeering Projects
speech communication using laser receiver circuit

Light offers the fastest path for transmission of signals in comparison to any other medium. The circuit “Speech Communication using Laser” makes use of this aspect, it is a one or two-way optical communications system using a short-wavelength visible laser diode (say, RLT6505 or the laser module of a laser pointer) as the light-emitting element, free space as the transmission media and a light-dependent resistor as the light-receiving element. This system is a perfect medium for speech communication between two adjacent offices or between homes on the opposite sides of…

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Simple Radio Transmitter

Engineeering Projects
circuit diagram of simple radio transmitter

The circuit shown here is of the simple radio transmitter which is used to transmit a voice signal up to 20M and is listening to a radio resistor. The complete circuit is built around a single transistor followed by a micro-phone and an MW antenna for any old radio. If the sound is not clear at the receiver, then adjust the ferrite core of the MW coil and fixed it where clear sound listens. Check out other interesting projects based on FM posted on bestengineeringprojects.com Arduino FM Receiver Circuit using…

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